#nullable enable

using System;
using System.Collections.Generic;
using System.Threading.Tasks;
using BotFramework;
using BotFramework.Attributes;
using BotFramework.Enums;
using BotFramework.Utils;
using Castle.Core.Internal;
using Kruzya.TelegramBot.Core.Cache;
using Kruzya.TelegramBot.Core.Data;
using Kruzya.TelegramBot.Core.Extensions;
using Telegram.Bot;
using Telegram.Bot.Types;
using Telegram.Bot.Types.Enums;

namespace UserGroupTag
{
    public class Handler : BotEventHandler
    {
        private readonly CoreContext _db;
        private readonly ICacheStorage<long, User> _userCache;

        public Handler(CoreContext db, ICacheStorage<long, User> userCache)
        {
            _db = db;
            _userCache = userCache;
        }
        
        [ParametrizedCommand(InChat.Public, "add_group", CommandParseMode.Both)]
        public async Task HandleAddGroup(string groupName)
        {
            // var groupName = group.Text;
            var repliedMessage = RawUpdate.Message!.ReplyToMessage;
            if (repliedMessage == null || repliedMessage.From!.IsBot || !(await Bot.CanPunishMember(Chat, From)) || string.IsNullOrEmpty(groupName))
            {
                return;
            }

            var from = repliedMessage.From;
            var fromId = from.Id;
            var chatId = Chat!.Id;
            
            var userGroupOption = await _db.UserValues.FindOrCreateOption(Chat.Id, "userGroups");
            var tagDictionary = userGroupOption.GetValue(new Dictionary<string, List<long>>());

            var memberList = tagDictionary.GetValueOrDefault(groupName, new List<long>());
            if (memberList.Contains(fromId))
            {
                await Bot.SendTextMessageAsync(chatId, $"{from.ToHtml()} уже находится в группе {groupName}", 
                    parseMode: ParseMode.Html);
                return;
            }
            memberList.Add(repliedMessage.From.Id);
            tagDictionary[groupName] = memberList;
            
            userGroupOption.SetValue(tagDictionary);
            _db.AddOrUpdate(userGroupOption);

            _userCache.SetValue(repliedMessage.From.Id, repliedMessage.From, Int32.MaxValue);
            await Bot.SendTextMessageAsync(chatId, $"{from.ToHtml()} добавлен в группу {groupName}", 
                parseMode: ParseMode.Html);
        }

        [ParametrizedCommand(InChat.Public, "tag_group", CommandParseMode.Both)]
        public async Task HandleTagGroup(string groupName)
        {
            if (string.IsNullOrEmpty(groupName))
            {
                return;
            }

            var userGroupOption = await _db.UserValues.FindOption(Chat.Id, "userGroups");

            var userList = userGroupOption?.GetValue<Dictionary<string, List<long>>>()?[groupName];
            if (userList == null || userList.Count == 0)
            {
                return;
            }

            var msg = new HtmlString()
                .Text("Пользователь ")
                .UserMention(From)
                .Text($" призывает группу пользователей {groupName}: ");
            foreach (var userId in userList)
            {
                msg.UserMention(await GetUser(userId, Chat)).Text(", ");
            }

            await Bot.SendTextMessageAsync(Chat.Id, msg.ToString().TrimEnd(',', ' '), parseMode: ParseMode.Html);
        }

        protected async Task<User> GetUser(long userId, Chat chat)
        {
            User user;
            if (!_userCache.TryGetValue(userId, out user))
            {
                user = (await Bot.GetChatMemberAsync(Chat.Id, userId)).User;
                _userCache.SetValue(userId, user, Int32.MaxValue);
            }

            return user;
        }
    }
}